You say "Well for once no one said check ignition timeing!" You say that because with the ignition off, timing cant have anything to do with dieseling right ? I always thought the same thing until about a year ago. With no spark, how can timing have anything at all to do with an engine's tendency to diesel ???
Well i found out last year that ignition timing can have everything to do with an engines tendency to diesel at shutdown.
I have a heavy tandem truck with a GMC 478 V6 engine. As long as I have owned this truck, it ran hot, was underpowered and dieseled terribly at warm shutdown. Last year I discovered the timing marks on this engine had slipped position(damper outer ring had slipped) and actually were running the timing very late, very retarded. I repaired the timing marks and correctly timed the engine. It now ran much cooler and had much more power. Another thing really shocked me, this old engine no longer dieseled at a warm shutdown ????? Why ??? The late ignition timing was making the exhaust valves run very hot, hot enough to light off the fuel and keep the engine rattling along on a few cylinders.
So I learned that late ignition timing can have a dramatic effect on an engines tendency to diesel at shutdown. Your never too old to learn new things ;-) Im 64. ;-)
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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